Breeze2 autocomplete requires `click-complete` to be installed

Apache Airflow version

main (development)

What happened

When I setup autocomplete for Breeze2 on a “bare” system when I have no packages installed, It fails autocomplete with this error:

ModuleNotFoundError: No module named 'click_completion'
Traceback (most recent call last):
  File "/home/jarek/.pyenv/versions/3.7.9/bin/Breeze2", line 33, in <module>
    sys.exit(load_entry_point('apache-airflow-breeze', 'console_scripts', 'Breeze2')())
  File "/home/jarek/.pyenv/versions/3.7.9/bin/Breeze2", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/home/jarek/.local/lib/python3.7/site-packages/importlib_metadata/__init__.py", line 194, in load
    module = import_module(match.group('module'))
  File "/home/jarek/.pyenv/versions/3.7.9/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/jarek/code/airflow/dev/breeze/src/airflow_breeze/breeze.py", line 24, in <module>
    import click_completion
ModuleNotFoundError: No module named 'click_completion'

It seems that “autocomplete” feature of Breeze2 requires click-completion to be installed first. This is a small issue an small prerequisite but I think it is not handled by the currrent setup-autocomplete

The same happens if you install Breeze2 with pipx.

What you expected to happen

I expect that click-completion package is automatically installled in when ./Breeze2 setup-autocomplete is executed. Also it should be described in the documentation as prerequisite

How to reproduce

• make sure you have no packages installed in your Python “system environment” (for example: pip list | xargs pip uninstall -y )
• type ./Breeze2<TAB>

Operating System

Linux Mint 20.1.3

Versions of Apache Airflow Providers

Not relevant

Deployment

Other

Deployment details

No airflow deployment

Anything else

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project’s Code of Conduct

[potiuk]

Yeah . I think we have too many “variables” so for now indeed fixing it in docs will be enough. One more thing we could do is - instead of “doing” stuff in the “setup-autocomplete”, we could simply ask the user to make sure that “click-complete” is installed as system package.

Writing this as [yellow] warning and some example instructions (same as in docs) as the setup-autocomplete output should do the job.

[potiuk]

Basically the problem is that the user does not have the .venv from Breeze activated at the moment the TAB is pressed (it only gets activated once you run ./Breeze2 command. That’s why click-completion needs to be installed as “system” package